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High temperature and high pressure oil-based mud system

An oil-based mud, high temperature and high pressure technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem that the dispersion and gelation rate of organic soil have not been significantly improved, and the performance of oil-based mud cannot be improved. Improve the lipophilic performance, good film-forming performance and improve the dispersibility

Active Publication Date: 2022-03-08
BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic soils in the prior art generally have the technical defects of poor dispersion and low gelation rate in the oil-based mud system. For this reason, scholars at home and abroad have conducted a lot of research on the modification of organic soils, and most of them use long-chain quaternary Ammonium salts are used to modify organic soil, but the effect is not ideal, the utilization rate of modifier is low, the reaction process is complicated, the dispersion and gelation rate of organic soil have not been significantly improved, and the oil base cannot be improved. mud properties

Method used

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  • High temperature and high pressure oil-based mud system

Examples

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Effect test

Embodiment 1

[0029] The invention provides a high-temperature and high-pressure oil-based mud system, which includes the following raw materials in parts by weight: 70 parts of white oil, 7 parts of calcium chloride brine, 2 parts of modified organic soil, and 3 parts of coconut oil fatty acid Ethanolamide, 1 part of wetting agent, 3 parts of limestone powder, 4 parts of humic acid-based graft copolymer and 350 parts of weighting material; the weighting material has a density of 4.2g / cm 3 barite;

[0030] The preparation method of described modified organic soil is:

[0031] In parts by weight, weigh 3 parts of chitosan and 0.8 parts of vinyltriethoxysilane and add it to 50 parts of distilled water, stir evenly and heat to 75°C, stop heating after stirring for 120 minutes, and let it stand for cooling to room temperature, remove the supernatant, collect the first filter residue in the lower part, wash, dry, grind and pulverize until the particle size is less than 100nm to obtain modified ...

Embodiment 2

[0044] A high temperature and high pressure oil-based mud system, the difference from Example 1a is that the preparation method of the bentonite suspension is specifically:

[0045] In parts by weight, weigh 50 parts of bentonite and disperse in water, add 8 parts of cetyltrimethylammonium bromide after fully stirring, stir and react at 50°C for 30 minutes, remove the filtrate by centrifugation, and collect the third filter residue, wash with water, and dry to obtain modified bentonite;

[0046] Disperse the obtained modified bentonite evenly in the acetic acid solution, add acrylamide and ammonium persulfate to the acetic acid solution, and then stir and react at 70°C for 30 minutes to obtain the product; the mixture of acrylamide, ammonium persulfate and pretreated bentonite The mass ratio is 10:0.1:1. All the other conditions and parameters are the same as in Example 1a.

[0047]

[0048] A high temperature and high pressure oil-based mud system, the difference from Exa...

Embodiment 3

[0060] A high-temperature and high-pressure oil-based mud system, the difference from Example 2c is that the bentonite has undergone activation treatment before modification, specifically: bentonite, calcium hydroxide and ammonium nitrate solution with a mass fraction of 10%, according to the mass fraction Mix at a ratio of 9:1:18, then filter after infrared treatment, collect the fourth filter residue, disperse the fourth filter residue evenly in deionized water, store it in a freezer at -17°C, and take it out after 16 hours Thaw, dry, and then roast in a muffle furnace at a temperature of 195°C for 3 hours to obtain primary activated bentonite, put the primary activated bentonite into a plasma activator, and treat it with plasma carbon dioxide gas for 5 minutes under a pressure of 55 Pa to obtain . All the other conditions and parameters are the same as in Example 2c.

[0061]

[0062] A high-temperature and high-pressure oil-based mud system, which includes the following...

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Abstract

The invention discloses a high-temperature and high-pressure oil-based mud and a preparation method thereof, which comprises the following raw materials in parts by weight: 70-80 parts of base oil, 7-10 parts of calcium chloride brine, 2-6 parts of modified Organic soil, 3-8 parts of emulsifier, 1-3 parts of wetting agent, 3-4 parts of limestone powder, 4-7 parts of fluid loss control agent and 350-400 parts of weighting material. The present invention modifies vinyltriethoxysilane on bentonite through the intercalation reaction of bentonite and chitosan to improve the oil dispersibility, suspension and colloidal properties of organic clay in oil-based mud, and further improve the oil-based mud. High temperature resistance and fluid loss control.

Description

technical field [0001] The invention relates to the technical field of mud used for oil field drilling. More specifically, the present invention relates to a high temperature and high pressure oil-based mud system. Background technique [0002] Drilling fluid includes water-based mud and oil-based mud. Oil-based mud is a mud system with oil as the continuous phase. Compared with water-based mud, oil-based mud has good lubricity, thermal stability, and shale formation. Stability and outstanding oil layer protection features are gradually widely used in drilling large-position wells, deep wells, and complex wells. [0003] Organic soil is the most basic lipophilic colloid in oil-based mud. In oil-based mud, organic soil is an indispensable additive. Organic soil can not only increase the viscosity and shear force of the mud, but also reduce the fluid loss of the oil-based mud. . The organic soils in the prior art generally have the technical defects of poor dispersion and l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/32C09K8/03
CPCC09K8/32C09K8/03
Inventor 孟虎吴骏峰谷团杨涛贾振甲张晓东王鑫鑫陈玉东
Owner BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE
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